error[E0308]: mismatched types
  --> $DIR/tuple-arity-mismatch.rs:6:20
   |
LL |     let y = first ((1,2.0,3));
   |                    ^^^^^^^^^ expected a tuple with 2 elements, found one with 3 elements
   |
   = note: expected tuple `(isize, f64)`
              found tuple `(isize, f64, {integer})`

error[E0308]: mismatched types
  --> $DIR/tuple-arity-mismatch.rs:12:20
   |
LL |     let y = first ((1,));
   |                    ^^^^ expected a tuple with 2 elements, found one with 1 element
   |
   = note: expected tuple `(isize, f64)`
              found tuple `(isize,)`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.